In an interview with Clive Anderson, Philip revealed that they have just recorded a new version of Sam Shephard's play True West for Radio 4 which has been produced by Robert's wife, Celia.
True West is about the sibling rivalry between two estranged brothers who have reconnected. No air date for the project has been announced yet, but we'll keep you posted.
Phil's fans aren't the only ones who are excited at the news, Robert's daughter (and therefore, Phil's neice), Emily took to Twitter to express her excitment!
You can listen to the rest of Philip's interview below: